For what:
In my old post "List attached USB devices in USB Host mode", Anonymous commented have to check the xml file "/system/etc/permissions/handheld_core_hardware.xml" for < feature name="android.hardware.usb.host" />. Coincidentally I have a post to "Run Linux command with ProcessBuilder", so I modify it to display the content of "/system/etc/permissions/handheld_core_hardware.xml" using Linux command "cat".

Or, you can pull the file from your device using DDMS of Android Development Tools.

/system/etc/permissions/handheld_core_hardware.xml in HTC One X

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2009 The Android Open Source Project
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!-- These are the hardware components that all handheld devices
must include. Devices with optional hardware must also include extra
hardware files, per the comments below.
Handheld devices include phones, mobile Internet devices (MIDs),
Personal Media Players (PMPs), small tablets (7" or less), and similar
devices.
-->
<permissions>
<feature name="android.hardware.camera" />
<feature name="android.hardware.location" />
<feature name="android.hardware.location.network" />
<feature name="android.hardware.sensor.compass" />
<feature name="android.hardware.sensor.accelerometer" />
<feature name="android.hardware.bluetooth" />
<feature name="android.hardware.touchscreen" />
<feature name="android.hardware.microphone" />
<feature name="android.hardware.screen.portrait" />
<feature name="android.hardware.screen.landscape" />
<!-- devices with GPS must include android.hardware.location.gps.xml -->
<!-- devices with an autofocus camera and/or flash must include either
android.hardware.camera.autofocus.xml or
android.hardware.camera.autofocus-flash.xml -->
<!-- devices with a front facing camera must include
android.hardware.camera.front.xml -->
<!-- devices with WiFi must also include android.hardware.wifi.xml -->
<!-- devices that support multitouch must include the most appropriate one
of these files:
If only partial (non-independent) pointers are supported:
android.hardware.touchscreen.multitouch.xml
If up to 4 independently tracked pointers are supported:
include android.hardware.touchscreen.multitouch.distinct.xml
If 5 or more independently tracked pointers are supported:
include android.hardware.touchscreen.multitouch.jazzhand.xml
ONLY ONE of the above should be included. -->
<!-- devices with an ambient light sensor must also include
android.hardware.sensor.light.xml -->
<!-- devices with a proximity sensor must also include
android.hardware.sensor.proximity.xml -->
<!-- GSM phones must also include android.hardware.telephony.gsm.xml -->
<!-- CDMA phones must also include android.hardware.telephony.cdma.xml -->
<!-- Devices that have low-latency audio stacks suitable for apps like
VoIP may include android.hardware.audio.low_latency.xml. ONLY apps
that meet the requirements specified in the CDD may include this. -->
</permissions>